Step 1. (December) Students have to understand the main difference between borders and walls;
Step 2. (January) Students have to work on the geographical borders of their region or country related to the historical background in order to understand their social and historical evolution;
Step 3. (February-March) Students have to prepare pictures, powerpoints and padlets to make guess the right match between the description (written or oral) of the walls and borders and the effective building;  
Step 4 (March-June). Students have to prepare the tags to create an interactive map.